A function that reverses a string using a loop

Question

def main():
    print(reverseString("Hello"))

def reverseString(string):
    newString=""
    for i in range(len(string)-1,-1):
        newString+=string[i]
    print newString

main()

I tried running this code but nothing is printed and I don't know what the problem is.

Answer 1

This is missing the step of -1 in the range():

for i in range(len(string)-1, -1, -1):

Without the step the for loop immediately exits, leaving newstring as ''.

BTW: you are not returning anything from reverseString() so:

print(reverseString("Hello"))

Will print None, which I assume is not wanted. You probably want to:

return newString

in reverseString().